Between each terminal of the same polarities: 1000 VAC 50/60 Hz for 1 minBetween each terminal of the different polarities: 1500 VAC 50/60 Hz for 1 minBetween live-metallic part and ground: 1500 VAC 50/60 Hz for 1 minBetween each terminal and non-live-metallic part: 1500 VAC 50/60 Hz for 1 min